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《Journal of Vibration and Shock》 2007-08
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ANALYSES ON CHARACTERISTIC FREQUENCIES OF BACKGROUND SOUND IN COCKPIT OF AIRPLANE BASED ON DIFFERENT METHODS

YI Chui-jie1, CHENG Dao-lai2, GUO Jian-xiang1, YAO Hong-yu3, YANG Lin3(1.College of Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China; 2.Qingdao R&D Center of Energy and Environment, Qingdao Technological University, Qingdao 266033, China; 3.Center of Aviation Safety Technology, General Civil Aviation Administration of China, Beijing 100028, China)  
Characteristic frequencies of background sound recorded by Cockpit Voice Recorder(CVR) are the key evidence in investigating accident or incident causes for wrecked airplane. It is also crucial for investigator to verify the characteristic frequencies through different methods, because wrecked airplane data(sound information)recorded by CVR are not permitted to be opened and the unusual data are not easy to be captured in flight. At the same time, it is difficult to obtain exact characteristic frequencies with the aid of traditional methods of differentiating hearing by cockpit voice decoding system(CVDS) and spectrum analysis by audio software. To resolve the problems, as an example of the overspeed audio frequency warning sound signal, its characteristic frequency has been obtained and analyzed through three different methods, which are wavelet transform, chirp Z transform and correlation analysis respectively. The frequency results are credible. Through the study, it concludes that the three methods are feasible to confirm the characteristic frequencies, and the results can meet the requirement of accident cause investigation for wrecked airplane.
【Fund】: 国家自然科学基金(60572182);; 中国民航总局科技项目;; 山东省外专局项目(G20063700001)资助
【CateGory Index】: V241
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